What is CVE-2026-52936?

CVE-2026-52936 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 4.2 onward and patched in 6.6.141, 6.12.91, 6.18.33 and others. CVE-2026-52936 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-52936?

CVE-2026-52936 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-52936?

Yes, CVE-2026-52936 has been patched. Fixed versions include 6.6.141, 6.12.91, 6.18.33 and others. If you are running Linux kernel 4.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-52936 actively exploited?

CVE-2026-52936 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-52936

Medium

In the Linux kernel, the following vulnerability has been resolved: crypto: jitterentropy - replace long-held spinlock with mutex jent_kcapi_random() serializes the shared jitterentropy state, but it currently holds a spinlock across the jent_read_entropy() call. That path performs expensive jitter collection and SHA3 conditioning, so parallel readers can trigger stalls as contending waiters spin for the same lock. To prevent non-preemptible lock hold, replace rng->jent_lock with a mutex so contended readers sleep instead of spinning on a shared lock held across expensive entropy generation.

Package Linux Kernel

Published 2026-06-24

Last modified 2026-07-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 4.2 and later are affected. Fixed in 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1 and their respective stable series.

Affected from

≥ 4.2

Fixed in

✓ 6.6.141 6.6.x ✓ 6.12.91 6.12.x ✓ 6.18.33 6.18.x ✓ 7.0.10 7.0.x ✓ 7.1

References

5 total

Kernel Git
https://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351

Patch
Kernel Git
https://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4

Patch
Kernel Git
https://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4

Patch
Kernel Git
https://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02

Patch
Kernel Git
https://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880

Patch

Details

CVE ID CVE-2026-52936

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-06-24

Modified 2026-07-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-52936?

CVE-2026-52936 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.2 onward and has been patched in 6.6.141, 6.12.91, 6.18.33 and others. CVE-2026-52936 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-52936?

CVE-2026-52936 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-52936?

Yes. CVE-2026-52936 has been patched. Fixed versions include 6.6.141, 6.12.91, 6.18.33 and others. If you are running Linux kernel 4.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-52936 actively exploited?

No. CVE-2026-52936 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.